Tooth grinding error and contact characteristic control method for cycloid tooth bevel gear pair

Abstract

The invention discloses a tooth grinding error and contact characteristic control method for a cycloid tooth bevel gear pair, which comprises the following steps of 1, carrying out continuous indexing tooth grinding processing on a bull wheel by utilizing a generatrix of a conical sand rod, and enabling the motion trail of the conical sand rod to be an extension-like epicycloid, 2, calculating a normal vector, a diameter vector and a curvature parameter of a midpoint of a tooth surface contact area of the bull wheel grinding tooth, 3, solving a theoretical normal vector, a theoretical diameter vector and a theoretical curvature parameter of the midpoint of the tooth surface contact area of the small gear grinding tooth, which meets a conjugate contact condition, by utilizing a conjugate meshing principle, 4, introducing tool parameters for iterative solution, guaranteeing that the normal vector, the diameter vector and the curvature parameters in the small wheel gear grinding tooth surface contact area are equal to theoretical values, and acquiring continuous indexing gear grinding machining parameters of the small wheel, and 5, conducting continuous indexing tooth grinding on the small wheel according to the machining parameters obtained in the fourth step. What can be guaranteed is that the state of a tooth surface contact area after continuous indexing gear grinding is consistent with the state of a contact area after end face gear hobbing.

Description

technical field [0001] The invention relates to the processing and manufacturing of cycloidal bevel gears, in particular to a method for controlling grinding errors and contact characteristics of cycloidal bevel gear pairs. Background technique [0002] The face hobbing method can carry out continuous indexing processing, while the end face milling method can only carry out single indexing processing, that is, after processing a tooth surface, the cutter head is separated from the tooth blank, and the tooth blank is rotated at an angle, and then the gear cutting process is performed . Therefore, the face hobbing method has higher processing efficiency than the face milling method, and is widely used in the gear industry. However, due to the forming principle of the face hobbing method, the longitudinal tooth profile curve of the profile wheel tooth surface is an extended epicycloid generated by continuous indexing motion, and it is difficult to use a grinding wheel for grin...

AI Technical Summary

Problems solved by technology

However, for gear pairs with large deformation after heat treatment, the grinding process cannot change the position of the contact area. Therefore, the grinding process has certain application conditions and cannot be used in the case of large deformation during heat treatment. The gears with over-toothed teeth can only be used in pairs and do not have good interchangeability

Or use cemented carbide blades to scrape and remove a thin layer of hardened surface for finishing, but when using cemented carbide scraping tools, higher requirements are placed on the strength of the tool and the rigidity of the machine tool to avoid Due to the periodic fluctuation of the cutting force, the tool is damaged, resulting in a large cost loss. This method is difficult to adapt to the trend of modern manufacturing

Moreover, the forming principle of the gear grinding method has changed compared with the face hobbing method, and the shape of the tooth surface has also changed, which will cause the shape and position of the contact area of ​​the large and small wheels of the gear pair to change, which will affect the contact transmission performance of the gear pair.

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